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/* audio_resample.h
*
* Copyright (c) 2003-2012 HandBrake Team
* This file is part of the HandBrake source code
* Homepage: <http://handbrake.fr/>
* It may be used under the terms of the GNU General Public License v2.
* For full terms see the file COPYING file or visit http://www.gnu.org/licenses/gpl-2.0.html
*/
/* Implements a libavresample wrapper for convenience.
*
* Supports sample_fmt and channel_layout conversion.
*
* sample_rate conversion will come later (libavresample doesn't support
* sample_rate conversion with float samples yet). */
#ifndef AUDIO_RESAMPLE_H
#define AUDIO_RESAMPLE_H
#include <math.h>
#include <stdint.h>
#include "libavutil/audioconvert.h"
#include "libavresample/avresample.h"
/* Default mix level for center and surround channels */
#define HB_MIXLEV_DEFAULT ((double)M_SQRT1_2)
typedef struct
{
int resample_needed;
AVAudioResampleContext *avresample;
struct
{
int channels;
int linesize;
uint64_t channel_layout;
double center_mix_level;
double surround_mix_level;
enum AVSampleFormat sample_fmt;
} in;
struct
{
int channels;
int linesize;
int sample_size;
int normalize_mix_level;
uint64_t channel_layout;
enum AVSampleFormat sample_fmt;
enum AVMatrixEncoding matrix_encoding;
} out;
} hb_audio_resample_t;
/* Initialize an hb_audio_resample_t for converting audio to the requested
* sample_fmt and channel_layout, using the specified matrix_encoding.
*
* Input characteristics are set via hb_audio_resample_update().
*/
hb_audio_resample_t* hb_audio_resample_init(enum AVSampleFormat output_sample_fmt,
uint64_t output_channel_layout,
enum AVMatrixEncoding matrix_encoding,
int normalize_mix_level);
/* Update an hb_audio_resample_t, setting the input sample characteristics.
*
* Can be called whenever the input type may change.
*
* new_channel_layout is sanitized automatically.
*/
int hb_audio_resample_update(hb_audio_resample_t *resample,
enum AVSampleFormat new_sample_fmt,
uint64_t new_channel_layout,
double new_surroundmixlev,
double new_centermixlev,
int new_channels);
/* Free an hb_audio_remsample_t. */
void hb_audio_resample_free(hb_audio_resample_t *resample);
/* Convert input samples to the requested output characteristics
* (sample_fmt and channel_layout + matrix_encoding).
*
* Returns an hb_buffer_t with the converted output.
*
* resampling is only done when necessary.
*/
hb_buffer_t* hb_audio_resample(hb_audio_resample_t *resample,
void *samples, int nsamples);
#endif /* AUDIO_RESAMPLE_H */
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